Part III. ] R. S. Hole : Useful Exotics in Indian Forests. 
15 
should certainly be paid to the qualifications of our indige¬ 
nous species as valuable avenue trees and ornamental plants 
and which are frequently overlooked. 
(Ill) In order to realise the maximum economic benefit from the 
work which has been done in the past, it is essential to 
arrange for the systematic collection and publication of all 
the available information regarding those exotics which have 
been introduced in the past and which distinctly promise 
to be of forest importance in India. Special attention for 
instance would be paid to those species which have grown, 
or which promise to grow, well in low-lying forest-encircled 
grasslands subject to frost and drought, on hot dry rocky 
slopes and plateaus at various elevations, on shifting sand, 
on landslips, on soil which has been hardened and com¬ 
pacted by grazing, on areas liable to water-logging, and in 
short in all unfavourable habitats where we find it difficult 
to obtain valuable growth of our indigenous species. Illus¬ 
trations and descriptions to facilitate the identification of 
the species would be given, with notes on the conditions 
prevailing in their natural habitats, the history of their 
introduction into India and the conditions under which they 
have been found to thrive, the places where seed may be 
obtained and their economic uses. With this object, it is 
proposed to issue a series of publications from this office, so 
far as possible with the co-operation of local Forest officers 
and the Superintendents of the various Botanical and 
Agri-horticultural Gardens, of which the present paper, 
dealing with Prosopis juliflora , DC., may be regarded as 
the first. 
(IV) It is advisable to limit the future cultivation of exotics, as far 
as possible, to those special localities where we have difficulty 
in obtaining valuable growth of our indigenous species and 
where better results might possibly be obtained with 
carefully selected exotics. The following may be mention¬ 
ed as examples of such areas. 
[a) Bare rocky slopes and plateaus which are, as a rule, 
essentially dry habitats, only suited for the development 
of xerophilous species. 
[ 139 ] 
Collection and 
publication 
of informa¬ 
tion on useful 
exotics 
already intro¬ 
duced. 
Future 
cultivation 
of exotics to 
be on a 
limited scale 
in selected 
localities. 
